《反相器設計》ppt課件-全文預覽
【正文】 ith Load Load(CL) Delay Cint CL Delay = (Cint + CL)= Cint(1+ CL /Cint) Delay (Internal) + Delay (Load) CN CP = 2CN 2W W 17 Delay Formula ? ?? ? ? ??/1/~0intftCCCRtCCRD e l a ypintLWpLintW?????Cint = ?Cgin with ? ? 1 f = CL/Cgin effective fanout 反相器的本征延遲： tp0 = Cint CL Cgin WNP RRR ?? u n i tu n i tg i n CWWC 3?18 Apply to Inverter Chain CL In Out 1 2 N tp = tp1 + tp2 + …+ tpN ????????? ?jginjginWpj CCCRt,1,int 1~ ?LNg i nNi jg i njg i npNjjpp CC CCttt ???????????? ?????? 1,1 ,1,01, ,1 ?19 Optimal Tapering for Given N Delay equation has N 1 unknowns, Cgin,2 – Cgin,N Minimize the delay, find N 1 partial derivatives Result: Cgin,j+1/Cgin,j = Cgin,j/Cgin,j1 Size of each stage is the geometric mean of two neighbors each stage has the same effective fanout (f＝ Cout/Cin) each stage has the same delay 1,1, ??? jg i njg i njg i n CC
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